Apple’s latest iOS 26 software development kit (SDK) gives the clearest sign so far that a foldable iPhone could be coming.
At the recent WWDC event, Apple revealed that starting with the iOS 26 SDK, apps will no longer run in letterboxed or scaled modes on new screen sizes. In the past, when Apple introduced new devices with different screen shapes or sizes, older apps would appear scaled or letterboxed until developers updated their apps with the latest SDK.
Now, with iOS 26, apps must be designed to flexibly adapt to any screen size without scaling. Apple specifically mentioned this change applies to “new hardware” with “new screen sizes,” suggesting preparation for devices with unusual displays.
This update aligns with ongoing rumors about Apple developing a foldable iPhone. According to leaks, the foldable iPhone might feature a unique aspect ratio for its inner large screen, which would need apps to adjust fluidly without letterboxing or scaling.
Apple’s new policy means developers must ensure their apps work well across all possible screen shapes and sizes — especially important if foldable iPhones become real.
While Apple did not confirm any specific device, this SDK change is a strong hint that Apple is preparing for major display innovations in the near future.
